ZSPM4013KIT ZMDI, ZSPM4013KIT Datasheet - Page 14

• Manufacturer Part Number: ZSPM4013KIT
• Description: Power Management IC Development Tools DC-DC Converter Kit
• Manufacturer: ZMDI
• Type: DC/DC Converters, Regulators & Controllersr

Specifications of ZSPM4013KIT

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: ZSPM4013
• Input Voltage: 6 V to 24 V
• Output Voltage: 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V, 0.9 V to 5 V
• Output Current: 3 A

Figure 3.2
3.1.
3.1.1.
The current through the high side FET is sensed on a cycle-by-cycle basis, and if the current limit is reached, it
will abbreviate the cycle. In addition, the device senses the FB pin to identify hard short conditions and will direct
the VSW output to skip 4 cycles if the current limit occurs when FB is low. This allows current built up in the
inductor during the minimum on time to decay sufficiently. The current limit is always active when the regulator is
enabled. Soft start ensures that current limit does not prevent regulator startup.
An additional feature of the over-current protection circuitry is that under extended over-current conditions, the
device will automatically disable. A simple toggle of the EN enable pin will return the device to normal operation.
3.1.2.
If the temperature of the die exceeds 170°C (typical), the VSW outputs will tri-state to protect the device from
damage. The PG and all other protection circuitry will stay active to inform the system of the failure mode. Once
the ZSPM4013 cools to 160°C (typical), the device will attempt to start up again, following the normal soft start
sequence. If the device reaches 170°C, the shutdown/restart sequence will repeat.
3.1.3.
The reference in this device is ramped at a rate of 4ms to prevent the output from overshoot during startup. This
ramp restarts whenever there is a rising edge sensed on the EN pin. This occurs in both the fixed and adjustable
versions. During the soft start ramp, current limit is still active and still protects the device if the output is shorted.
3.1.4.
If the output of the regulator exceeds 103% of the regulation voltage, the VSW outputs will tri-state to protect the
ZSPM4013 from damage. This check occurs at the start of each switching cycle. If it occurs during the middle of a
cycle, the switching for that cycle will complete and the VSW outputs will tri-state at the start of the next cycle.
3.1.5.
The ZSPM4013 is held in the off state until VCC reaches 5.75V (typical). There is hysteresis on this input (see
section 1.4).
Data Sheet
October 10, 2012
ZSPM4013
High Efficiency 3A Synchronous Buck Converter
Internal Protection Details
Internal Current Limit
Thermal Shutdown
Reference Soft-Start
Output Over-Voltage
VCC Under-Voltage Lockout
Monitor and Control Logic Functionality
EN
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.10
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
V
V
Internal
TSD
OUT-UV
POR
CC-UV
Filter
Filter
Filter
Filter
Filter
V
OUT-OV
I
OCD
OCD_Filter
Filter
REGULATOR
VSW OUTPUT
ENABLE
PG
TRI-STATE
14 of 21